v1.2.0: add code to check issuers and claims
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README.md
88
README.md
@ -43,13 +43,22 @@ keyfetch.oidcJwks("https://example.com/").then(function (results) {
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});
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```
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Quick JWT verification:
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Quick JWT verification (for authentication):
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```js
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var keyfetch = require('keyfetch');
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var jwt = '...';
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keyfetch.verify({ jwt: jwt }).then(function (decoded) {
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keyfetch.jwt.verify(jwt).then(function (decoded) {
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console.log(decoded);
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});
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```
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JWT verification (for authorization):
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```js
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var options = { issuers: ['https://example.com/'], claims: { role: 'admin' } };
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keyfetch.jwt.verify(jwt, options).then(function (decoded) {
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console.log(decoded);
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});
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```
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@ -74,7 +83,7 @@ keyfetch.oidcJwk(
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console.log(result.thumprint);
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console.log(result.pem);
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jwt.verify(jwt, pem);
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jwt.jwt.verify(jwt, { jwk: result.jwk });
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});
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```
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@ -147,12 +156,81 @@ keyfetch.oidcJwk(id, issuerUrl)
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### Verify JWT
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This can accept a _JWT string_ (compact JWS) or a _decoded JWT object_ (JWS).
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This can be used purely for verifying pure authentication tokens, as well as authorization tokens.
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```js
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keyfetch.verify({ jwt: jwk, strategy: 'oidc' })
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// Promises a decoded JWT { headers, payload, signature } or fails
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keyfetch.jwt.verify(jwt, { strategy: 'oidc' }).then(function (verified) {
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/*
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{ protected: '...' // base64 header
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, payload: '...' // base64 payload
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, signature: '...' // base64 signature
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, header: {...} // decoded header
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, claims: {...} // decoded payload
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}
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*/
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});
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```
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When used for authorization, it's important to specify which `issuers` are allowed
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(otherwise anyone can create a valid token with whatever any claims they want).
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If your authorization `claims` can be expressed as exact string matches, you can specify those too.
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```js
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keyfetch.jwt.verify(jwt, {
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strategy: 'oidc'
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, issuers: [ 'https://example.com/' ]
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, claims: { role: 'admin', sub: 'abc', group: 'xyz' }
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}).then(function (verified) {
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```
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* `strategy` may be `oidc` (default) , `auth0`, or a direct JWKs url.
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* `issuers` must be a list of https urls (though http is allowed for things like Docker swarm)
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* `claims` is an object with arbitrary keys (i.e. everything except for the standard `iat`, `exp`, `jti`, etc)
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* `exp` may be set to `false` if you're validating on your own (i.e. allowing time drift leeway)
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* `jwks` can be used to specify a list of allowed public key rather than fetching them (i.e. for offline unit tests)
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* `jwk` same as above, but a single key rather than a list
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### Decode JWT
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```jwt
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try {
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console.log( keyfetch.jwt.decode(jwt) );
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} catch(e) {
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console.error(e);
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}
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```
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```js
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{ protected: '...' // base64 header
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, payload: '...' // base64 payload
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, signature: '...' // base64 signature
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, header: {...} // decoded header
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, claims: {...} // decoded payload
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```
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It's easier just to show the code than to explain the example.
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```js
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keyfetch.jwt.decode = function (jwt) {
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// Unpack JWS from "compact" form
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var parts = jwt.split('.');
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var obj = {
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protected: parts[0]
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, payload: parts[1]
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, signature: parts[2]
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};
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// Decode JWT properties from JWS as unordered objects
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obj.header = JSON.parse(Buffer.from(obj.protected, 'base64'));
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obj.claims = JSON.parse(Buffer.from(obj.payload, 'base64'));
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return obj;
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};
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```
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### Cache Settings
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@ -6,19 +6,71 @@ var testIss = "https://example.auth0.com";
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keyfetch.init({});
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keyfetch.oidcJwks(testIss).then(function (hits) {
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keyfetch._clear();
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console.log(hits);
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//console.log(hits);
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return keyfetch.oidcJwk(hits[0].thumbprint, testIss).then(function () {
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return keyfetch.oidcJwk(hits[0].thumbprint, testIss).then(function (jwk) {
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console.log(jwk);
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return keyfetch.oidcJwk(hits[0].thumbprint, testIss).then(function (/*jwk*/) {
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//console.log(jwk);
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});
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});
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}).then(function () {
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console.log("Fetching PASSES");
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}).catch(function (err) {
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console.error("NONE SHALL PASS!");
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console.error(err);
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process.exit(1);
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});
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/*global Promise*/
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var keypairs = require('keypairs.js');
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keypairs.generate().then(function (pair) {
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return keypairs.signJwt({
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jwk: pair.private, iss: 'https://example.com/', sub: 'mikey', exp: '1h'
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}).then(function (jwt) {
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return Promise.all([
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keyfetch.jwt.verify(jwt, { jwk: pair.public }).then(function (verified) {
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if (!(verified.claims && verified.claims.exp)) {
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throw new Error("malformed decoded token");
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}
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})
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, keyfetch.jwt.verify(keyfetch.jwt.decode(jwt), { jwk: pair.public }).then(function (verified) {
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if (!(verified.claims && verified.claims.exp)) {
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throw new Error("malformed decoded token");
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}
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})
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, keyfetch.jwt.verify(jwt, { jwks: [pair.public] })
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['https://example.com/'] })
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['https://example.com'] })
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['*'] })
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['http://example.com'] })
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.then(e("bad scheme")).catch(throwIfNotExpected)
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['https://www.example.com'] })
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.then(e("bad prefix")).catch(throwIfNotExpected)
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['https://wexample.com'] })
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.then(e("bad sld")).catch(throwIfNotExpected)
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, issuers: ['https://example.comm'] })
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.then(e("bad tld")).catch(throwIfNotExpected)
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, claims: { iss: 'https://example.com/' } })
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, keyfetch.jwt.verify(jwt, { jwk: pair.public, claims: { iss: 'https://example.com' } })
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.then(e("inexact claim")).catch(throwIfNotExpected)
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]).then(function () {
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console.log("JWT PASSES");
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}).catch(function (err) {
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console.error("NONE SHALL PASS!");
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console.error(err);
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process.exit(1);
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});
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});
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});
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/*
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var jwt = '...';
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keyfetch.verify({ jwt: jwt }).catch(function (err) {
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console.log(err);
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});
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*/
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function e(msg) {
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return new Error("ETEST: " + msg);
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}
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function throwIfNotExpected(err) {
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if ("ETEST" === err.message.slice(0, 5)) { throw err; }
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}
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196
keyfetch.js
196
keyfetch.js
@ -202,45 +202,116 @@ function normalizeIss(iss) {
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}
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return iss.replace(/\/$/, '');
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}
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keyfetch._decode = function (jwt) {
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keyfetch.jwt = {};
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keyfetch.jwt.decode = function (jwt) {
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var parts = jwt.split('.');
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return {
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header: JSON.parse(Buffer.from(parts[0], 'base64'))
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, payload: JSON.parse(Buffer.from(parts[1], 'base64'))
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, signature: parts[2] //Buffer.from(parts[2], 'base64')
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// JWS
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var obj = {
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protected: parts[0]
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, payload: parts[1]
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, signature: parts[2]
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};
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// JWT
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obj.header = JSON.parse(Buffer.from(obj.protected, 'base64'));
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obj.claims = JSON.parse(Buffer.from(obj.payload, 'base64'));
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return obj;
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};
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keyfetch.verify = function (opts) {
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var jwt = opts.jwt;
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keyfetch.jwt.verify = function (jwt, opts) {
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if (!opts) { opts = {}; }
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return Promise.resolve().then(function () {
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var decoded;
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var exp;
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var nbf;
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var valid;
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try {
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decoded = keyfetch._decode(jwt);
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exp = decoded.payload.exp;
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nbf = decoded.payload.nbf;
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} catch (e) {
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throw new Error("could not parse opts.jwt: '" + jwt + "'");
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var active;
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var issuers = opts.issuers || ['*'];
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var claims = opts.claims || {};
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if (!jwt || 'string' === typeof jwt) {
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try { decoded = keyfetch.jwt.decode(jwt); }
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catch (e) { throw new Error("could not parse jwt: '" + jwt + "'"); }
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} else {
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decoded = jwt;
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}
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if (exp) {
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valid = (parseInt(exp, 10) - (Date.now()/1000) > 0);
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if (!valid) {
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exp = decoded.claims.exp;
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nbf = decoded.claims.nbf;
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if (!issuers.some(isTrustedIssuer(decoded.claims.iss))) {
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throw new Error("token was issued by an untrusted issuer: '" + decoded.claims.iss + "'");
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}
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// TODO verify claims also?
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if (!Object.keys(claims).every(function (key) {
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if (claims[key] === decoded.claims[key]) {
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return true;
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}
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})) {
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throw new Error("token did not match on one or more authorization claims: '" + Object.keys(claims) + "'");
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}
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active = ((opts.exp || 0) + parseInt(exp, 10) - (Date.now()/1000) > 0);
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if (!active) {
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// expiration was on the token or, if not, such a token is not allowed
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if (exp || false !== opts.exp) {
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throw new Error("token's 'exp' has passed or could not parsed: '" + exp + "'");
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}
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}
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if (nbf) {
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valid = (parseInt(nbf, 10) - (Date.now()/1000) <= 0);
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if (!valid) {
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active = (parseInt(nbf, 10) - (Date.now()/1000) <= 0);
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if (!active) {
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throw new Error("token's 'nbf' has not been reached or could not parsed: '" + nbf + "'");
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}
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}
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if (opts.jwks || opts.jwk) {
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return overrideLookup(opts.jwks || [opts.jwk]);
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}
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var kid = decoded.header.kid;
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var iss;
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var fetcher;
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var fetchOne;
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if (!opts.strategy || 'oidc' === opts.strategy) {
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iss = decoded.claims.iss;
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fetcher = keyfetch.oidcJwks;
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fetchOne = keyfetch.oidcJwk;
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} else if ('auth0' === opts.strategy || 'well-known' === opts.strategy) {
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iss = decoded.claims.iss;
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fetcher = keyfetch.wellKnownJwks;
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fetchOne = keyfetch.wellKnownJwk;
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} else {
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iss = opts.strategy;
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fetcher = keyfetch.jwks;
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fetchOne = keyfetch.jwk;
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}
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var p;
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if (kid) {
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p = fetchOne(kid, iss).then(verifyOne); //.catch(fetchAny);
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} else {
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p = fetcher(iss).then(verifyAny);
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}
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return p;
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function verifyOne(hit) {
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if (true === keyfetch.jws.verify(decoded, hit)) {
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return decoded;
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}
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throw new Error('token signature verification was unsuccessful');
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}
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function verifyAny(hits) {
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if (hits.some(function (hit) {
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if (kid) {
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if (kid !== hit.jwk.kid && kid !== hit.thumbprint) { return; }
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if (true === keyfetch.jws.verify(decoded, hit)) { return true; }
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throw new Error('token signature verification was unsuccessful');
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} else {
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if (true === keyfetch.jws.verify(decoded, hit)) { return true; }
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}
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})) {
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return decoded;
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}
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throw new Error("Retrieved a list of keys, but none of them matched the 'kid' (key id) of the token.");
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}
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function overrideLookup(jwks) {
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return Promise.all(jwks.map(function (jwk) {
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var Keypairs = jwk.x ? Eckles : Rasha;
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@ -251,63 +322,28 @@ keyfetch.verify = function (opts) {
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});
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})).then(verifyAny);
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}
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});
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};
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keyfetch.jws = {};
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keyfetch.jws.verify = function (jws, pub) {
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var alg = 'SHA' + jws.header.alg.replace(/[^\d]+/i, '');
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var sig = ecdsaAsn1SigToJwtSig(jws.header, jws.signature);
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return require('crypto')
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.createVerify(alg)
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.update(jws.protected + '.' + jws.payload)
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.verify(pub.pem, sig, 'base64')
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;
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};
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var kid = decoded.header.kid;
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var iss;
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var fetcher;
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var fetchOne;
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if (!opts.strategy || 'oidc' === opts.strategy) {
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iss = decoded.payload.iss;
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fetcher = keyfetch.oidcJwks;
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fetchOne = keyfetch.oidcJwk;
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} else if ('auth0' === opts.strategy || 'well-known' === opts.strategy) {
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iss = decoded.payload.iss;
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fetcher = keyfetch.wellKnownJwks;
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fetchOne = keyfetch.wellKnownJwk;
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} else {
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iss = opts.strategy;
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fetcher = keyfetch.jwks;
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fetchOne = keyfetch.jwk;
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}
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var payload = jwt.split('.')[1]; // as string, as it was signed
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if (kid) {
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return fetchOne(kid, iss).then(verifyOne); //.catch(fetchAny);
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} else {
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return fetcher(iss).then(verifyAny);
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}
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function verify(hit, payload) {
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var alg = 'SHA' + decoded.header.alg.replace(/[^\d]+/i, '');
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var sig = ecdsaAsn1SigToJwtSig(decoded.header, decoded.signature);
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return require('crypto')
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.createVerify(alg)
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.update(jwt.split('.')[0] + '.' + payload)
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.verify(hit.pem, sig, 'base64')
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;
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}
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function verifyOne(hit) {
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if (true === verify(hit, payload)) {
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return decoded;
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}
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throw new Error('token signature verification was unsuccessful');
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}
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function verifyAny(hits) {
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if (hits.some(function (hit) {
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if (kid) {
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if (kid !== hit.jwk.kid && kid !== hit.thumbprint) { return; }
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if (true === verify(hit, payload)) { return true; }
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throw new Error('token signature verification was unsuccessful');
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} else {
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if (true === verify(hit, payload)) { return true; }
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}
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})) {
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return decoded;
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}
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throw new Error("Retrieved a list of keys, but none of them matched the 'kid' (key id) of the token.");
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}
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// old, gotta make sure nothing else uses this
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keyfetch._decode = function (jwt) {
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var obj = keyfetch.jwt.decode(jwt);
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return { header: obj.header, payload: obj.claims, signature: obj.signature };
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};
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keyfetch.verify = function (opts) {
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var jwt = opts.jwt;
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return keyfetch.jwt.verify(jwt, opts).then(function (obj) {
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return { header: obj.header, payload: obj.claims, signature: obj.signature };
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});
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};
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@ -346,3 +382,11 @@ function ecdsaAsn1SigToJwtSig(header, b64sig) {
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.replace(/=/g, '')
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;
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}
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function isTrustedIssuer(issuer) {
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return function (trusted) {
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if ('*' === trusted) { return true; }
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// TODO normalize and account for '*'
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return issuer.replace(/\/$/, '') === trusted.replace(/\/$/, '') && trusted;
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};
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}
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@ -1,6 +1,6 @@
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{
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"name": "keyfetch",
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"version": "1.1.10",
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"version": "1.2.0",
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"description": "Lightweight support for fetching JWKs.",
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"homepage": "https://git.coolaj86.com/coolaj86/keyfetch.js",
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"main": "keyfetch.js",
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